PERFORMANCE ANALYSIS OF ECONOMISER AND RE-ENGINEERING OF PROCESS BOILER OPERATION

Abstract

A boiler serves as the life line of any process plant. Around 10% of the total expenses are incurred on the boiler. Detailed description of boiler parts and process of steam generation is explained in the thesis. Condition of in-service Economizer tubes badly deteriorated due to the cold end corrosion and results in inefficient boiler operation. Due to frequent leakages of tubes boiler had to be shutdown many times, so directly it effects the production of product. Frequent leakages involve maintenance jobs which in turn increases the maintenance cost. Detailed study have been carried out by taking the parameters before and after the economizer replacement. It has been observed that the flue gas temperature exhaust to atmosphere was quite high before replacement of economizer while after replacement it came down significantly. Steam-fuel ratio with corroded economizer was in range 12 to 12.5 while with new economizer it increases in range 13.5 to 14.0. Analysis of the economizer...